Everyone Says "Wait for Warm Soil" — Here's What Soil Actually Needs to Hit 60°F

https://www.scribd.com/document/993515852/Stop-Killing-Your-Houseplants-A-Practical-30-Day-Rescue-Plan-for-Homeowners-in-Their-30s-50s-169836

How my backyard experiment lost half its seedlings by planting too soon I’m going to be blunt: we all pretended that “last frost date” was the rule and started sowing when we felt optimistic